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How to use Array.from with Mapping Function In Javascript

Method 3: Using Spread Operator

Using Array.from with a mapping function efficiently concatenates arrays. The mapping function combines multiple arrays into a single array by spreading them within Array.from, resulting in a concatenated array with concise syntax and good performance

Example: In this example we concatenates three arrays (array1, array2, array3) using the spread operator and Array.from(), creating a single concatenatedArray with all elements. It then logs the combined array to the console.

JavaScript 
const array1 = [1, 2];
const array2 = [3, 4];
const array3 = [5, 6];

const concatenatedArray = Array.from([...array1, ...array2, ...array3]);
console.log(concatenatedArray);

Output
[ 1, 2, 3, 4, 5, 6 ]




What is the most efficient way to concatenate N arrays in JavaScript ?

In this article, we will see how to concatenate N arrays in JavaScript. The efficient way to concatenate N arrays can depend on the number of arrays and the size of arrays.

To concatenate N arrays, we use the following methods:

Table of Content

  • Using push() Method
  • Using concat() Method
  • Using Spread Operator
  • Using Array.from with Mapping Function:

Similar Reads

Method 1: Using push() Method

We create the N arrays and then concatenate the array by using the push() method. In this, we also use the spread operator(…) which iterates over each of the values....

Method 2: Using concat() Method

First, we will create N arrays and then apply the concat() method to concatenate N arrays. The concat() method is used to merge N arrays together. This method does not alter the original arrays and returns the new Array....

Method 3: Using Spread Operator

You can also use Spread Operator to concatenate N arrays. For this, first, we will create N arrays and then apply Spread Operator to concatenate N arrays....

Method 4: Using Array.from with Mapping Function:

Using Array.from with a mapping function efficiently concatenates arrays. The mapping function combines multiple arrays into a single array by spreading them within Array.from, resulting in a concatenated array with concise syntax and good performance...

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Method 3: Using Spread Operator